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MAQ20 Analog Input Modules Thermocouple

Interface to Types J, K, T, R and S Thermocouples

The MAQ20 thermocouple analog input modules have 8 differential input channels. Separate models are offered for interfacing to Type J, Type K, Type T and Types R and S thermocouples. Cold Junction Compensation uses four internal sensors resulting in industry leading measurement accuracy in any system configuration and over the entire system operating temperature range. All channels are individually configurable for range, alarm limits, and averaging to match the most demanding applications. High, Low, High-High and Low-Low alarms provide essential monitoring and warning functions to ensure optimum process flow and fail-safe operation. Hardware low-pass filtering in each channel provides rejection of 50 Hz and 60 Hz line frequencies. Field I/O connections are made through spring cage terminal blocks with four positions provided for the termination of wiring shields.

Input-to-bus isolation is a robust 1500 Vrms and each individual channel is protected up to 150 Vrms continuous overload in case of inadvertent wiring errors. Overloaded channels do not adversely affect other channels in the module, thereby preserving data integrity.

Channels in a module can be selectively enabled for scanning. All channels are enabled by default; however, non-used channels can be disabled to increase the sampling rate of enabled channels.

Input ranges are selectable on a per-channel basis. The MAQ20-JTC, -KTC, -TTC and -RSTC modules have two to four user selectable input ranges, depending on the model. Over-range and under-range up to 2% beyond the specified input values is allowed. Sensor linearization is performed in the module, and accuracy is guaranteed to ±f.s.

Circuit diagram Dataforth MAQ20 Analog Input Modules Thermocouple

Block Diagram MAQ20 Analog Input Modules Thermocouple

PDF Downloads:

  • Data Sheet MAQ20 Analog Input Modules: Thermocouple
  • Full catalogue MAQ20
  • Product Overview MAQ20
  • Brochure MAQ20
  • Accessories MAQ20

  • 4 Modules for Type MAQ20 Analog Input Modules Thermocouple:

    MAQ20-JTC -100°C to +760°C (Default),
    -100°C to +393°C,
    -100°C to +199°C
    Analog Input Module, Type J Thermocouple, 8-channel, Differential
    MAQ20-KTC -100°C to +1350°C (Default),
    -100°C to +651°C,
    -100°C to +332°C
    Analog Input Module, Type K Thermocouple, 8-channel, Differential
    MAQ20-TTC -100°C to +400°C (Default),
    -100°C to +220°C
    Analog Input Module, Type T Thermocouple, 8-channel, Differential
    MAQ20-RSTC Type R
    -100°C to +1750°C (Default),
    -100°C to +990°C,
    -100°C to +332°C;
    Type S
    -100°C to +1750°C,
    -100°C to +970°C
    Analog Input Module, Type R and Type S Thermocouple, 8-channel, Differential


  • 8 Differential Input Channels
  • Interface to Types J, K, T, R and S Thermocouples
  • All Channels Individually Configurable for Range, Alarms, Averaging
  • 1500 Vrms Input-to-Bus Isolation
  • Each Channel Protected up to 240 Vrms Continuous Overload
  • Selective Enabling of Module Channels for Scanning
  • Operating Temperature –40°C to +85°C
  • Dimensions 114.6 x 15.3 x 82.8 mm
  • UL/CUL Class I, Division 2, Groups A, B, C, D Pending